CN104143405B - A kind of connection structure and its manufacturing method - Google Patents
A kind of connection structure and its manufacturing method Download PDFInfo
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- CN104143405B CN104143405B CN201310172536.7A CN201310172536A CN104143405B CN 104143405 B CN104143405 B CN 104143405B CN 201310172536 A CN201310172536 A CN 201310172536A CN 104143405 B CN104143405 B CN 104143405B
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Abstract
The invention discloses a kind of connection structures and its manufacturing method for magnetic resonance imaging system superconducting magnet.The connection structure includes positive pole pipe and cooling block, and the cooling block, which is provided with, accommodates the through-hole that the positive pole pipe passes through, and the gap between the outer wall and the through-hole inner surface of the positive pole pipe is filled with insulating heat-conductive colloid material.Connection structure proposed by the present invention compares existing connection structure, and more compact structure saves space；Production method is simple, and cost of manufacture is also greatly lowered；Mechanical property is better than existing connection structure, can reduce the case where leading to structural failure due to stress, avoids the maintenance cost of great number, and once damage is easily replaced.
Description
【Technical field】
The present invention relates to magnetic resonance imaging (MRI, Magnetic Resonance Imaging) technical fields, more particularly to
A kind of connection structure and its manufacturing method for magnetic resonance imaging system superconducting magnet.
【Background technology】
Superconducting magnet is an important component in magnetic resonance imaging system, and Fig. 1 shows the super of magnetic resonance imaging system
The structural schematic diagram of magnetizer, superconducting magnet are the intermediate annulus shape for being equipped with cavity, including cryostat 4 and magnet
10, magnet 10 is located in cryogen vessel 5, and is dipped into liquid refrigerant 8 and is cooled to superconducting state；Vacuum chamber 9 is located at institute
The both sides outermost layer that cryostat 4 is contacted with air is stated, cryogen vessel 5 is located at the middle layer of the cryostat 4；
One or more heat radiation screenings 7 are equipped in vacuum space between cryogen vessel 5 and outer vacuum chamber 9；12, refrigeration machine
In turret 11, refrigeration machine 12 usually has two or more refrigeration-grades；First refrigeration-grade is connected to radiation shield 7, and will
The shielding is cooled to the temperature within the scope of 50-100K；Refrigerant gas 6 in cryogen vessel 5 is cooled to by the second refrigeration-grade
Refrigerant gas 6 is become liquid refrigerant 8 by the temperature in the regions 4-10K by condensing again.
Negative electricity connection to magnet 10 usually provides by 4 main body of cryostat and negative cable 14 and arrives magnet 10；Just
Electrical connection is usually provided by anode cable 15, and in order to which external power supply is connected to anode cable 15, positive electrical connector must be worn
The wall outside turret 11 is crossed, and needs to be electrically insulated with cryogen vessel 5, such positive electrical connector 2 is commonly referred to as anode
Pipe 2.
Positive pole pipe 2 must be electrically connected to external power supply, so external heat can be transmitted to magnet 10 by positive pole pipe 2
In, so being cooled down to positive pole pipe 2 with cooling block 3, the level-one cold head that cooling block 3 passes through heat conduction cable 13 and refrigeration machine 12
It is connected, it is therefore desirable to make heat conduction between positive pole pipe 2 and cooling block 3.
When usually working, positive pole pipe 2 is cooled to the boiling temperature of about helium close to one end of cryogen vessel 5
4.2K, while positive pole pipe 2 is likely to be breached 300K or higher close to one end of ambient enviroment.At this point, the temperature of cooling block is about
60K, must have efficiently the heat at environment end to be prevented to be passed to cryogen vessel end, between positive pole pipe 2 and cooling block 3 compared with
High heat conductivility.
To be cooled down simultaneously to positive pole pipe 2 and cathode tube 1 with cooling block 3, it is necessary to prevent shape between positive pole pipe 2 and cathode tube 1
At short circuit, it is therefore desirable to make to insulate between positive pole pipe 2 or cathode tube 1 and cooling block 3.
In normal operation, into the induced current of magnet 5, or the output current that is introduced from magnet 5, across magnet
5 will be not more than 20V to the voltage of the insulator between positive pole pipe 2 and cooling block 3, and effective electricity is provided under such voltage
What insulation was relatively easy to.However, in the case where superconducting magnet quenches suddenly, superconducting magnet suddenly becomes resistance
, it will produce prodigious voltage at the both ends of the magnet coil of magnet 5.In this case, being up to about the voltage of 5kv may go out
The insulator now and between positive pole pipe 2 and cooling block 3.It is required for providing in any such connection and is sufficient to resist kilovoltage
Electrical isolation.
When usually installing, general cooling block 3 is fixed, and positive pole pipe 2 is respectively necessary for and anode cable 15 and electricity due to both ends
Leadthrough connection is flowed, so can be by larger power, it is necessary to assure the connection just between pole pipe 2 and cooling block 3 can be by certain force
When will not damage.
In conclusion positive connection structure between pole pipe 2 and cooling block 3 needs good insulation heat-conducting property, and
It is not easy to be damaged when by larger shearing force.
Fig. 2 is a kind of connection structure of existing positive pole pipe and cooling block.As shown in Fig. 2, with high temperature etc. in positive pole pipe 2
Plasma spray method sprays one layer of ceramics layer 19, sprays one layer of oxygen-free copper bisque 20, cooling block 3 and nothing again on ceramics layer 19
Oxygen copper powder layer 20 passes through soldering connection.Ceramics layer 19 plays insulating effect, ceramics layer 19 is done very thin, keeps it full
The demand of sufficient high heat conduction.
This connection structure is capable of providing satisfied insulation performance and heat conductivility.But the ceramic powder in connection structure
Layer 19 can be crushed under certain mechanically or thermally pressure, be easy to damage.The broken of ceramics layer 19 can lead to its insulation performance
Forfeiture, and cryogen vessel 5 can be caused to be polluted by ceramic crushing piece.Technical staff reduces positive pole pipe when can pass through operation
2 stress prevents the rupture of ceramics layer 19, but do not solve this disadvantage in itself.
Also, the manufacturing method of this connection structure is complicated, needs high-temperature plasma spraying process and soldering processes, manufactures
Cost is also higher.
Once ceramics layer 19 is broken, then need to cut off the welding of entire turret 11 and exterior vacuum chamber's wall to carry out more it
It changes.If the damage of the ceramics layer at user leads to recalling for cooled equipment and cryostat, might have higher
It spends.In short, existing connection structure is once damaged, not easy to repair, replacement.
Also some other method can connect positive pole pipe and cooling block, such as be connected with, then between them
The dielectrics such as placing ceramic piece, this connection structure is unstable at low temperature, and the thermal conductivity of potsherd is relatively low, if potsherd compared with
It is thick then cooling effect is undesirable, be very easy to if relatively thin it is broken, when the temperature difference is larger, potsherd itself be easy by thermal stress and
It is broken, therefore this connection structure cannot stablize use in the superconducting magnet of magnetic resonance imaging system.
It is, therefore, desirable to provide one kind is hardly damaged, manufacturing process is simple, and manufacturing cost is relatively low, is easily changed after damage,
And meet the connection structure of heat conductive insulating requirement.
【Invention content】
What the present invention solved be connection structure in the prior art mechanical property it is poor, be easily damaged；Manufacturing process is complicated,
Manufacturing cost is higher；And the problem of being not easy to replace after damaging.
To solve the above-mentioned problems, the present invention proposes a kind of connection structure, including positive pole pipe and cooling block, the cooling block
It is provided with and accommodates the through-hole that the positive pole pipe passes through, the gap between the outer wall and the through-hole of the positive pole pipe is filled with insulation
Heat conduction colloidal materials.
Optionally, the insulating heat-conductive colloid material is nanometer ALN composite materials.
Optionally, the thickness of the insulating heat-conductive colloid material of the gap filling between the outer wall and the through-hole of the positive pole pipe
Degree is 0.3mm~0.8mm.
Optionally, the insulating heat-conductive colloid material is discontinuously arranged along the circumferential direction of the positive pipe outer wall.
Optionally, circumferentially continuous distribution of the insulating heat-conductive colloid material along the positive pipe outer wall.
Optionally, the insulating heat-conductive colloid material part in the gap exposes cooling block outside or is all contained in cold
But inside block.
Optionally, the positive pole pipe is stainless steel tube, and the cooling block is made of oxygen-free copper.
The present invention also proposes a kind of manufacturing method of connection structure, for manufacturing connection knot as described in any one of the above embodiments
Structure includes the following steps：
(1) through-hole that positive pole pipe is passed through to cooling block, the positive pole pipe and cooling block are fixed, make institute respectively using fixture
State between the inner surface of through-hole and the outer wall of the positive pole pipe that there are gaps；
(2) the insulating heat-conductive colloid material of the liquid is packed into the gap；
(3) connection structure is toasted so that the insulating heat-conductive colloid material solidification of liquid.
Optionally, it is put into fence tooling in the gap, the insulating heat-conductive colloid material of the liquid is packed into institute
It states in the gap separated by the fence tooling between positive pole pipe and cooling block so that the insulating heat-conductive colloid material is described in
The circumferential direction of positive pipe outer wall is discontinuously arranged.
Optionally, after the insulating heat-conductive colloid material of the liquid is packed into the gap, the connection is tied
Structure is put into vacuum chamber, excludes air remaining in the insulating heat-conductive colloid material of the liquid.
The present invention, which compares the prior art, following advantageous effect：
1) manufacturing method is simple, is answered without manufacturing high-temperature plasma spraying and soldering etc. that existing connection structure needs
Miscellaneous technique, manufacturing cost are also greatly lowered；
2) use insulating heat-conductive colloid material instead of existing ceramics layer, mechanical property increases significantly, and can keep away
The case where exempting to cause connection structure to be damaged due to stress when mounted, and once damage is easily replaced damaged parts；
3) existing connection structure is compared, connection structure of the invention is more compact, therefore can save space.
【Description of the drawings】
Fig. 1 is the structural schematic diagram of the superconducting magnet of magnetic resonance imaging system；
Fig. 2 is the schematic diagram of existing positive pole pipe and the connection structure of cooling block；
Fig. 3 is the schematic diagram of the positive pole pipe of the embodiment of the present invention one and the connection structure of cooling block；
Fig. 4 is the connection structure of the embodiment of the present invention one and the structure chart of fence tooling；
Fig. 5 is the manufacturing method flow chart of the positive pole pipe of the embodiment of the present invention one and the connection structure of cooling block；
Fig. 6 is showing for the heat conductivility test result of the positive pole pipe of the embodiment of the present invention one and the connection structure of cooling block
It is intended to；
Fig. 7 is the positive pole pipe of the embodiment of the present invention one and showing for the shearing force the performance test results of cooling connection structure
It is intended to；
Fig. 8 is the schematic diagram of the positive pole pipe of the embodiment of the present invention two and the connection structure of cooling block；
Fig. 9 is the schematic diagram of the positive pole pipe of the embodiment of the present invention three and the connection structure of cooling block.
【Specific implementation mode】
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings to the present invention
Specific implementation mode be described in detail.
Embodiment one
Fig. 3 is the schematic diagram of the positive pole pipe of the embodiment of the present invention one and the connection structure of cooling block, and Fig. 3, which is shown, to be used for
The positive pole pipe 2 of the superconducting magnet of magnetic resonance imaging system, upper cathode tube 17, lower cathode tube 18, cooling block 3,17 He of upper cathode tube
Lower cathode tube 18 is connected and fixed by high temperature vacuum brazing and cooling block 3, and positive pole pipe 2 is located at the upper cathode tube 17 and lower cathode
In the pipe that pipe 18 is formed, positive pole pipe 2 passes through a through-hole of cooling block 3, and there are skies between the outer wall and through-hole of positive pole pipe 2
Gap, to fill the insulating heat-conductive colloid material 16 for being connected and fixed positive pole pipe 2 and cooling block 3.The upper end junction chamber of positive pole pipe 3
Leadthrough 21 under temperature, lower end connect the conducting wire 22 for leading to cryogen vessel 4.
Cooling block 3 can be made of any high conductivity material, such as silver, aluminium metal, can also be Danization boron ceramics, carbon
Fibrous composite etc., the invention is not limited in this regard.
Preferably, cooling block 3 is made of oxygenless copper material, the positive pole pipe 2, upper cathode tube 17, and lower cathode tube 18 is not
Rust Steel material is made.
The present invention does not limit the type of the insulating heat-conductive colloid material 16, if it is resistant to the low temperature of minimum 4K, and
There is good insulating properties, thermal conductivity, mechanical property at low temperature, and have guarantor of the preferable caking property in the present invention with metal
It protects in range.
Preferably, the insulating heat-conductive colloid material 16 is nanometer ALN composite materials.
Nanometer ALN composite materials 16 are circumferentially discontinuously arranged along the outer wall of positive pole pipe 2, and thickness is 0.3mm~0.8mm.It will
Nanometer ALN composite materials 16 are arranged to circumferentially discontinuously arranged along the outer wall of the positive pole pipe 2 be that it becomes in temperature in order to prevent
Effect is expanded with heat and contract with cold and the rupture that is squeezed due to positive pole pipe 2 and nanometer ALN composite materials 16 itself when change.
Fig. 4 is the connection structure of the embodiment of the present invention one and the structure chart of fence tooling
Fig. 5 is the manufacturing method flow chart of the connection structure of the embodiment of the present invention one.
As shown in figure 5, the manufacturing method of the connection structure of the present embodiment includes the following steps：
Step S01 is executed, positive pole pipe 2 is passed through to the through-hole of cooling block 3, using fixture by the positive pole pipe 2 and cooling block 3
It fixes respectively, there are gaps between make the through-hole and the positive pole pipe 2 outer wall.
Specifically, positive pole pipe 2 can be cut to obtain with stainless steel tube, and cooling block 3 can be obtained by cutting oxygen-free copper block,
In the through-hole that the intermediate processing one of cooling block 3 accommodates positive pole pipe 2 and passes through, and make the outer of the through-hole and the positive pole pipe 2
Gap between wall is 0.3mm~0.8mm.
Step S02 is executed, the insulating heat-conductive colloid material 16 of the liquid is packed into the gap.In the present embodiment
In, step S02 specifically includes following steps：
Step S021 is executed, fence tooling 23 as shown in Figure 4 is put between the gap, the fence tooling 23 must
It must be not easy cohesive material for surface is smooth；
Step S022 is executed, the insulating heat-conductive colloid material 16 of liquid is imported into the sky separated by the fence tooling 23
In gap, keep the insulating heat-conductive colloid material 16 circumferentially discontinuously arranged along the outer wall of positive pole pipe 2, to make it fully infiltrate sky
Gap can be imported using vacuum；
Step S023 is executed, by connection structure (including positive pole pipe 2, cooling block 3, insulating heat-conductive colloid material 16 and grid
Column tooling 23) it is put into vacuum chamber, remaining air in the insulating heat-conductive colloid material 16 to exclude liquid.
Step S03 is executed, by connection structure (including positive pole pipe 2, cooling block 3, insulating heat-conductive colloid material 16 and fence
Tooling 23) it is taken out from vacuum chamber, it is put into baking box and toasts, taken out after so that the insulating heat-conductive colloid material 16 of liquid is cured.
Adding fence tooling 23 in manufacturing process, mainly there are three effects：1. hardness is filled in positive pole pipe 2 and cooling block 3
The concentricity of positive pole pipe 2 and cooling block 3 is improved in gap；2. at discontinuous shape after making heat-conducting insulation material 16 cure in gap；
3. fence tooling 23 finally can be retained in this connection, the insulating properties between positive pole pipe and cooling block, certainly, premise can be improved in this way
It is that the material of of fence tooling 23 itself is insulating materials, and can bear the temperature difference of 4.2K~500K, and has certain elasticity, energy
Absorb deformation when heat-conducting insulation material expands with heat and contract with cold.
The manufacturing method of the connection structure of the present embodiment is simpler compared to the manufacturing method of existing connection structure, without making
With complicated manufacturing process, and manufacturing cost is also greatly lowered.
Following performance test is carried out to the connection structure of the present embodiment：
Performance test one is the insulation performance of connection structure in the case of testing high voltage, as shown in table 1, the connection of the present embodiment
Structure has good insulation performance under room temperature and low temperature under high-pressure situations；
Table 1
Performance test is second is that whether test connection structure is broken or comes off phenomenon in the case of a high temperature, at room temperature to this
The positive pole pipe 2 of embodiment is passed through the electric current of 530A, and voltage 0.65V is kept for 10 minutes, heated, after ten minutes 2 temperature of positive pole pipe
Degree is 150 DEG C (423K), and the temperature of cooling block 3 is 120 DEG C (393K), and the temperature of nanometer ALN composite materials 16 is 120 DEG C
(393K), with this condition, the nanometer ALN composite materials 16 do not fall off phenomenon, and resistance does not decline；
Performance test three is to test the heat conductivility of connection structure at low temperatures, and Fig. 6 is the connection knot of the present embodiment
The result schematic diagram of the heat conductivility test of structure, the longitudinal axis in Fig. 6 are the voltage of thermometric diode, and voltage is higher, the temperature of representative
Degree is lower.As shown in fig. 6, at low temperature, the connection structure of the existing connection structure sprayed using ceramics layer is by adding
The temperature difference at positive pole pipe both ends is 54K, the temperature difference of the connection structure of the present embodiment at the positive pole pipe both ends after heating after heat
For 70K.Test result shows that the thermal conductivity of the connection structure of the present embodiment is slightly better than existing connection structure, illustrates this implementation
The heat conductivility of the connection structure of example is met the requirements.
Performance test four is to test the mechanical property of connection structure, and Fig. 7 is the anti-shearing force of the connection structure of the present embodiment
The result schematic diagram of test, as shown in fig. 7, the maximum shear stress that the connection structure of the present embodiment can be born reaches 7KN, shearing resistance
It is many by force to cut the existing connection structure of performance ratio.
Above-mentioned performance test shows that the insulation of connection structure of the invention and heat conductivility disclosure satisfy that requirement, and resists
Shearing force performance improves a lot, and is hardly damaged.
In addition, the connection structure of the present invention is more compact, space can be saved；And once damage is easily replaced, repairs.
Embodiment two
Fig. 8 is the schematic diagram of the connection structure of the embodiment of the present invention two, as shown in figure 8, insulating heat-conductive colloid material 16 '
It is continuously full of the gap between the positive pole pipe 2 and cooling block 3, insulating heat-conductive colloid material 16 ' partly exposes cooling block 3
Outside.
Embodiment three
Fig. 9 is the schematic diagram of the connection structure of the embodiment of the present invention three, as shown in figure 9, insulating heat-conductive colloid material 16 "
It is continuously full of the gap between the positive pole pipe 2 and cooling block 3, the insulating heat-conductive colloid material 16 " in the gap is all
It is contained in 3 the inside of cooling block.
In the present invention, each embodiment uses progressive literary style, the difference of emphasis description and previous embodiment each to implement
The same section of same procedure or structure with reference to the foregoing embodiments in example.
Although the invention has been described by way of example and in terms of the preferred embodiments, but it is not for limiting the present invention, any this field
Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair
Bright technical solution makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, and according to the present invention
Technical spirit to any simple modifications, equivalents, and modifications made by above example, belong to technical solution of the present invention
Protection domain.
Claims (5)
1. a kind of connection structure, including positive pole pipe and cooling block, the cooling block be provided with accommodate the positive pole pipe pass through it is logical
Hole, which is characterized in that the gap between the outer wall and the through-hole of the positive pole pipe is filled with insulating heat-conductive colloid material, described
Insulating heat-conductive colloid material is nanometer ALN composite materials, and the insulating heat-conductive colloid material is around in the positive pole pipe and edge
The axial direction of the positive pole pipe extends outside the gap between the positive pole pipe and cooling block, the outer wall of the positive pole pipe and institute
State in the gap between through-hole have fence tooling, the fence tooling include end ring and from end ring side along the positive pole pipe
Several spacer bars for extending in the same direction of axial direction, and several spacer bars being circumferentially arranged along the positive pole pipe, and the insulation
Circumferential direction behind the gap that the importing of heat conduction colloidal materials is separated by fence tooling along the positive pipe outer wall is discontinuously arranged, the grid
The material of column tooling is insulating materials and has elasticity.
2. connection structure as described in claim 1, which is characterized in that the sky between the outer wall and the through-hole of the positive pole pipe
The thickness of the insulating heat-conductive colloid material of gap filling is 0.3mm~0.8mm.
3. connection structure as described in claim 1, which is characterized in that the positive pole pipe is stainless steel tube, and the cooling block is
Oxygen-free copper is made.
4. a kind of manufacturing method of connection structure, which is characterized in that connect for manufacturing claims 1 to 3 any one of them such as
Binding structure, includes the following steps：
(1) through-hole that positive pole pipe is passed through to cooling block, is fixed the positive pole pipe and cooling block using fixture respectively, is made described logical
There are gaps between the inner surface in hole and the outer wall of the positive pole pipe；
(2) fence tooling, the fence are put into the gap between the inner surface of the through-hole and the outer wall of the positive pole pipe
Tooling includes end ring and several spacer bars for being extended in the same direction from end ring side along the axial direction of the positive pole pipe, and described several
Parting bead is circumferentially arranged along the positive pole pipe, by the insulating heat-conductive colloid material of liquid be packed into the positive pole pipe and cooling block it
Between by the gap of fence tooling partition so that the insulating heat-conductive colloid material along the positive pipe outer wall circumferential direction not
Continuously distributed, for the material of the fence tooling for insulating materials and with elasticity, the insulating heat-conductive colloid material is nanometer ALN
Composite material, the insulating heat-conductive colloid material extend around in the positive pole pipe and along the axial direction of the positive pole pipe
Outside gap between the positive pole pipe and cooling block；
(3) connection structure is toasted so that the insulating heat-conductive colloid material solidification of liquid.
5. the manufacturing method of connection structure as claimed in claim 4, which is characterized in that by the thermal plastic insulation of the liquid
After body material is packed into the gap, the connection structure is put into vacuum chamber, excludes the insulating heat-conductive colloid of the liquid
Remaining air in material.
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| CN201310172536.7A CN104143405B (en) | 2013-05-10 | 2013-05-10 | A kind of connection structure and its manufacturing method |
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| CN201310172536.7A CN104143405B (en) | 2013-05-10 | 2013-05-10 | A kind of connection structure and its manufacturing method |
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| CN104143405B true CN104143405B (en) | 2018-08-31 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104319058B (en) * | 2014-11-17 | 2017-01-04 | 中国科学院电工研究所 | A kind of superconducting joint chiller |
| CN108447645B (en) * | 2017-10-25 | 2021-06-01 | 德清创智科技股份有限公司 | Current lead anode tube for superconducting magnet and preparation method of anode tube insulating coating |
| CN110111968B (en) * | 2018-02-01 | 2022-02-11 | 西门子(深圳)磁共振有限公司 | Current lead structure of superconducting magnet, method for manufacturing same, and magnetic resonance apparatus |
| CN115258405B (en) * | 2022-08-22 | 2024-02-13 | 深圳市兰丰科技有限公司 | Semiconductor light-emitting diode connection structure and operation method |
| CN116864258B (en) * | 2023-08-08 | 2024-07-16 | 西安聚能超导磁体科技有限公司 | Support connection structure and superconducting magnet |
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| CN103035354B (en) * | 2012-12-25 | 2016-11-23 | 东北大学 | A kind of naked superconducting magnet |
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| US5524441A (en) * | 1993-12-03 | 1996-06-11 | Gec Alsthom Electromecanique Sa | Lead-in module for the supply of a low critical temperature superconducting electric load |
| US6490871B1 (en) * | 1997-09-30 | 2002-12-10 | Oxford Magnet Technology Limited | MRI or NMR systems |
| CN1426073A (en) * | 2001-11-21 | 2003-06-25 | 西门子公司 | Low temperature thermostat |
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